Correct overzealous deletion

Selection error caused if statement to have syntax error.

confluent_client/bin/nodeshell

@@ -72,7 +72,7 @@ def run():
                 run_cmdv(node, cmdv, all, pipedesc)
             else:
                 pendingexecs.append((node, cmdv))
-    if not all or exitcode
+    if not all or exitcode:
         sys.exit(exitcode)
     rdy, _, _ = select.select(all, [], [], 10)
     while all: